from werkzeug.security import generate_password_hash, check_password_hash
from itsdangerous import TimedJSONWebSignatureSerializer as Serializer
from flask import current_app
from flask_login import UserMixin
from . import db, login_manager


class Role(db.Model):
    __tablename__ = 'role'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), unique=True)
    # default = db.Column(db.Boolean, default=False, index=True)
    # permissions = db.Column(db.Integer)
    users = db.relationship('User', backref='role', lazy='dynamic')

    def __repr__(self):
        return '<Role %r>' % self.name


class Permission:
    READ = 0x00
    ADMINISTER = 0x80


class User(UserMixin, db.Model):
    __tablename__ = 'user'

    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(64), unique=True, index=True)
    username = db.Column(db.String(64), unique=True, index=True)
    role_id = db.Column(db.Integer, db.ForeignKey('role.id'))
    password_hash = db.Column(db.String(128))
    confirmed = db.Column(db.Boolean, default=False)

    @property
    def password(self):
        raise AttributeError('password is not a readable attribute')

    @password.setter
    def password(self, password):
        self.password_hash = generate_password_hash(password)

    def verify_password(self, password):
        return check_password_hash(self.password_hash, password)

    def generate_confirmation_token(self, expiration=3600):
        s = Serializer(current_app.config['SECRET_KEY'], expiration)
        return s.dumps({'confirm': self.id})

    def confirm(self, token):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token)
        except:
            return False
        if data.get('confirm') != self.id:
            return False
        self.confirmed = True
        db.session.add(self)
        return True

    def generate_reset_token(self, expiration=3600):
        s = Serializer(current_app.config['SECRET_KEY'], expiration)
        return s.dumps({'reset': self.id})

    def reset_password(self, token, new_password):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token)
        except:
            return False
        if data.get('reset') != self.id:
            return False
        self.password = new_password
        db.session.add(self)
        return True

    def generate_email_change_token(self, new_email, expiration=3600):
        s = Serializer(current_app.config['SECRET_KEY'], expiration)
        return s.dumps({'change_email': self.id, 'new_email': new_email})

    def change_email(self, token):
        s = Serializer(current_app.config['SECRET_KEY'])
        try:
            data = s.loads(token)
        except:
            return False
        if data.get('change_email') != self.id:
            return False
        new_email = data.get('new_email')
        if new_email is None:
            return False
        if self.query.filter_by(email=new_email).first() is not None:
            return False
        self.email = new_email
        db.session.add(self)
        return True

    def __repr__(self):
        return '<User %r>' % self.username


@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))


class Dictionary(db.Model):
    # __tablename__ = 'dictionary_fact'

    # id = db.Column(db.Integer, primary_key=True)
    # custom_id = db.Column(db.String(64), unique=True)
    # icd_id = db.Column(db.String(64), unique=True)
    # snomed_id = db.Column(db.String(64), unique=True)
    # name = db.Column(db.String(64))
    # description = db.Column(db.String(64))

    __tablename__ = 'dictionary_temp'
    id = db.Column(db.Integer, primary_key=True)
    code = db.Column(db.String(20), unique=True)
    ICD_code = db.Column(db.String(20), unique=True)
    SNO_code = db.Column(db.String(20), unique=True)
    name = db.Column(db.String(255))
    description = db.Column(db.String(255))


class ICD(db.Model):
    __tablename__ = 'icd_dim'

    id = db.Column(db.Integer, primary_key=True)
    icd_10_major_code = db.Column(db.String(64))
    icd_10_additional_code = db.Column(db.String(64))
    name = db.Column(db.String(64))
    alias = db.Column(db.String(64))
    description = db.Column(db.Text)


class SNOMED(db.Model):
    __tablename__ = 'snomed_dim'

    id = db.Column(db.Integer, primary_key=True)
    snomed = db.Column(db.String(64))
    name = db.Column(db.String(64))
    description = db.Column(db.String(64))


class Entity(db.Model):
    __tablename__ = 'mention_dim_temp'

    id = db.Column(db.Integer, primary_key=True)
    mention = db.Column(db.String)
    pos_b = db.Column(db.String)
    pos_e = db.Column(db.String)
    category = db.Column(db.String)
    content_id = db.Column(db.String)
    editUser = db.Column(db.String(16))
    editTime = db.Column(db.String(13))


class EMR(db.Model):
    __tablename__ = 'original_inpatient_data'
    id = db.Column(db.Integer, primary_key=True)
    mr_content = db.Column(db.Text)
